ASET Angular Spectrum Evaluation Tool U.S. Patent #
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2 Introduction to the American Gem Society ASET Angular Spectrum Evaluation Tool U.S. Patent #
3 The ASET uses the Angular Spectrum to display and evaluate the optical performance of diamonds.
4 Where does the light come from?
5 Light can come from any direction. Whether it s from the source or from reflections, light comes from many angles.
6 Even though light can come from any direction, our world is lit from above.
7 The AGS ASET color codes light performance based on I N T E N S I T Y Red is the MOST intense It is light that comes directly from the source Green is LESS intense It is light that is reflected Blue has NO intensity It is light that is blocked by the observer
8 Direct light is the most intense. This light comes directly from the source and is the most desirable. When viewing a diamond in the ASET, this light is represented by RED.
9 Reflected light is much dimmer or less intense than direct light. This light is a small fraction of direct light and is less desirable. When viewing a diamond in the ASET, this reflected light is represented by GREEN.
10 Obscured light, light blocked by the observer, causes areas of the diamond to appear dark. Dark areas, next to brighter areas create contrast. When viewing a diamond in the ASET, obscured or blocked light is represented by Blue.
11 Direct This is the general appearance of an AGS 0 Ideal. There can and will be variations of this pattern. Reflected Obscured Balanced Distribution
12 We know from our research diamonds exhibiting this pattern are the brightest and have the best fire.
13
14 Copyright American Gem Society 2005
15 Match the Red image to the bright areas in the diamond to the left. The bright areas represent direct light from above that is free from obscuration and at its most intense.
16 Match the Green image to the corresponding darker areas in the diamond to the left. These less intense areas represent the light that is reflected off walls and other objects. This light is much less intense and is less desirable.
17 Match the Blue image to the contrast in the diamond to the left. These darkened areas represent light that is blocked by your head and shoulders.
18 Leakage Leakage will show up as the color of your background (either black or white), in this case black. Remember that leakage is not desirable and in all cases should be minimized.
19 Take a moment to view these two images. By now, you know how each color in the ASET image conveys intensity. Red = Bright Green = Less Bright Blue = Not Bright
20 In Review Maximizing Red is good Some Blue is necessary Too much Green is undesirable The distribution of the three colors is important Either black or white is leakage (depending on the background) and should be minimized
21 An example of diamonds with the highest light performance are represented by the ASET images in the highlighted area of the above chart.
22 ASET image of a Princess cut diamond
23 Each cut has its own set of light performance standards. Fancy cut diamonds are not held to the same standard as the Round Brilliant.
24 Even though this Princess cut has considerably more green and lacks the exacting symmetry of the Round, it would receive an AGS 0 for light performance.
25 How to use the ASET Please refer to the individual tutorials
26 ASET Uses Light Performance Diamond Selection Diamond Identification Diamond Matching $$$Sales
27 Standalone Assessment Tool Provisional grades can be determined using Angular Spectrum theory.
28 Diamond Selection Diamond selection can be done with greater accuracy ensuring the best decision is made.
29 Diamond Identification Comparison of ASET image and AGS Performance Grading Software image
30 Diamond Matching and Pairing How many hours are wasted matching and pairing goods? How accurate are the matches? The ASET easily matches diamonds quickly and accurately
31 $$$ SALES $$$ Using the ASET during a sales presentation instills confidence, trust and professionalism. Your qualifications and knowledge of light performance make you unique and able to answer questions your competitors cannot. Seize the Advantage
32
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